-39424

Appears in sequences

• Let P(k,X) = Product_{i=1..2*k} (X-1/cos(Pi*(2*i-1)/(4*k)) ) which is a polynomial with integer coefficients. Sequence gives array of coefficients for P(k,X).at n=58A075615
• Array of coefficients in Zagier's polynomials P_(n,0)(x).at n=32A075733
• Triangle T, read by rows, where matrix power T^4 has powers of 4 in the secondary diagonal: [T^4](n+1,n) = 4^(n+1), with all 1's in the main diagonal and zeros elsewhere.at n=10A117254
• Column 0 of triangle A117254.at n=4A117255